Once upon a time, I wrote what I thought was a decent query letter. Then I found Query Shark and realized I had made approximately all the mistakes. I read your whole archive, spent weeks rewriting, and queried according to your suggestions. After fifteen rejections, I finally got the Call and signed with my agent. My agent liked my query so much, she actually used it with few alterations as her pitch to editors. And in just the last few weeks, I signed a two-book deal [with one of the Big Five.]
The impact of your advice on my success can't be overstated. Thank you for your time, generosity, and snark.